P.S.EDIT LINE "editor.bgcolor" to set desired black level. Ligh black 404040, Medium black, 363636, Very black 262626Darker black gives more contrast, but it also stains the eyes as the character and background are very different, so experiment to your taste.
Current Version (1.6.12) does not start with the theme.txt
Which theme.txt? Jerware's or smilem's version?
The Jerware theme is now updated and can be downloaded from https://github.com/per1234/ino-themes/archive/themeDark-Jerware.zip. I changed the line highlight and operator colors for contrast.